Southern Highlands

Of the Moon not Scotland. I like this phase, it reveals some wonderful detail. To give an idea of scale to these craters look at the prominent one in the upper centre that seems to have rays emanating from it across the lunar surface. This is Tycho named after the 16th c Danish astronomer Tycho Brahe. It is 53 miles in diameter which is near enough the distance from London to Oxford. The central mountain peak is six times taller than the Shard. Tycho was formed by an impact about 108 million years ago making it one of the youngest craters on the Moon. To the lower right is a much larger crater peppered with smaller impacts. This is Clavius, named after a 16th c German mathematician. Clavius is over 140 miles in diameter, think Sheffield to London, and is close to 4 billion years old.
How do we know they are this old? Apollo 17 brought back material from Tycho's impact ejecta rays which was analysed and aged in detail. The age of Clavius was estimated from its size and subsequent overlaid impacts after it was formed.
The photo is a phone shot taken through the eyepiece of my telescope.
Every day is a school day!